This is a great effect for beginners. It’s visually stunning and has been showcased by magicians on TV.
Show a blank deck of cards on the front and back. The cards can be riffled through, fanned, and spread out on the table to be shown blank. With a magical pass you can change a thought of card into a real printed card. Repeat this and when your ready, riffle through the entire deck and it has magically changed into a real deck of cards. You can show the fronts with faces and the card backs of the deck. You can repeat the trick as often as you want. Plus, it is instantly repeatable.
For $3.00 more you can buy a Clear Deck Protector to keep the box from getting dinged up or wet.